body {
    width: 100%;
}

#six-zhu {
    margin: 0;
    padding-top: 30px;
}

#six-if1 {
    width: 100%;
    height: 250px;
}

#six-if2 {
    width: 12%;
    height: 625px;
    margin-left: 12%;
    float: left;
    
}

#six-if3 {
    width: 100%;
    height: 400px;
}